Theoretical calculation
The theoretical calculations were done within a simplified interacting two-band model in two dimensions, employed previously [1]} with hole and electron pockets with small Fermi energies [Fig.8]. We assume superconductivity due to repulsive interactions. While the dominant interband interaction favors Cooper-pairing in the \(s\) -wave symmetry channel, the \(d\) -wave projected intraband interaction yields attraction in the d-wave channel. We obtained \(T_{pair}\)  from the solution of the linearized mean-field gap equations, whereas T\(_c\)  in each case is estimated from superfluid stiffness. Details of the calculations are given in the Supplemental Information.
